| 含裂纹的周期简支梁振动功率流特性 |
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| 引用本文： | 林言丽,郭杏林.含裂纹的周期简支梁振动功率流特性[J].大连理工大学学报,2004,44(2):181-185. |
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| 作者姓名： | 林言丽 郭杏林 |
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| 作者单位： | 大连理工大学,工程力学系,辽宁,大连,116024 |
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| 基金项目： | 辽宁省科学技术基金资助项目(002069). |
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| 摘 要： | 在周期简支梁中，利用周期结构理论、波在周期简支梁中的传播特性和裂纹受拉时的弯曲弹簧假设，推导了含裂纹梁单元受到激励时，单元左右两端输出的振动功率流计算公式；通过绘制的功率流比值曲线，给出了识别裂纹深度和位置的方法以及裂纹诊断的步骤和优势。
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| 关 键 词： | 振动功率流 裂纹梁 损伤 周期结构 裂纹诊断 |
| 文章编号： | 1000-8608(2004)02-0181-05 |
Characteristics of vibrational power flow of a cracked periodically supported infinite beam |
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| LINYan-li,GUOXing-lin.Characteristics of vibrational power flow of a cracked periodically supported infinite beam[J].Journal of Dalian University of Technology,2004,44(2):181-185. |
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| Authors: | LINYan-li GUOXing-lin |
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| Institution: | LINYan-li~*,GUOXing-lin |
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| Abstract: | In a periodically supported infinite beam, the formulas of vibrational power flow are deduced at left and right ends of the cracked bay with a point harmonic force acting on it. The deduction is mainly based on the periodic structure theory, the wave transmission characteristics in the periodically pinned-pinned supported beam and the opened crack model as a local spring. A method to diagnose the location and the depth of the crack is found from the curves of the flow rate. The steps are given and the good properties are shown. |
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| Keywords: | vibrational power flow cracked beam damage periodical structure |
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